We've just been to see it this afternoon. Enjoyed it enormously, won't reveal the ending, but I didn't see it coming at all. Haven't seen a scary movie for ages, really thought it was brilliant. The locations were all over the place - Essex, Peterborough, North Yorkshire. Only criticisms were about the locations, which didn't quite join us, and Daniel Radcliffe still is Harry Potter for me .... without the specs though! Highly recommended.